Spent a few hours modding my grey Courui today, setting it up with an XP-G2 & the Noctigon 32mm MCPCB.
Even with the 32mm board, the flat base of the reflector (which is 26mm wide) partially covers the solder pads.
If you want the reflector to sit flush, & you are using a smaller board, you will need to get creative.....
Waiting for mine to be shipped, hopefully soon.
Being a bit of a newbie here, and up for doing some light modding (at first) - what would you guys say are the ‘must do’s’ to get this baby upgraded to a better, safer spec without changing too many bits. ie, does the whole thing just need a rewire?
I’m not talking modding the actual led or driver yet or anything too drastic, I just want to do what they should have done in the first place, so to speak.
I did have a look at the teardown thread etc, but would appreciate some advice for a beginner. One of the main points they seemed to skimped on is the cable quality?
Thanks 
G0Ose, if I was gonna do one thing I’d address the ground issue in the tailcap. Make sure the inner trace where the springs are mounted have a more direct path to the outer trace where the screws ground it. That alone will give you better throughput.
Thanks, do you mean the braided wire bits?
I did see that somewhere , but for the life of me can’t find where…
The wire thickness is marginal, but at the stock current, it’s probably not holding too much back.
If you want to upgrade to a ‘better spec’, the mods all go hand-in-hand; Resistor mod to stock driver(very easy), which then necessitates thicker wiring, & then a copper MCPCB.
Even though there’s a few mod threads going for this light, I’m planning on posting another thread when mine is finished.
Not braided wire in the springs, but addressing the top of the pcb the springs are mounted on…inside the tail cap. Courui used a very thin wire to join the 2 traces, almost like a fuse. I scraped mask off in 3 places adjacent to the springs and soldered copper sheet between the traces, giving it a much more solid ground for the current to flow through. This made a big difference, as my hot rodding attempts were only getting 4A through. After doing this, it’s over 6A. Don’t remember exactly the amperage and am not at my desk to check, but the tail pcb set-up was holding it back.
Ah, the bit some people have put a thicker wire on? you mean the three dots in a triangle (sorry to sound like a complete idiot)
See where the spring pads are on the inner trace? I just cut bits of copper sheet and used solder paste to join the outer trace to that pad directly, in each spot. A thick wire at each point would work similarly. Or one really thick wire. Or a copper “washer” cut to go all the way around the board with the screws going through it. Anything to make ground more capable of carrying current.
All dependent on how much current you plan to run.
I put an MT-G2 in one of my Courui’s and it wanted to run at 13A and over 4000 lumens, limited it in the UI to allow 3030 lumens for better thermal control. If/when I get a copper pill for it from Buck, I’ll pull the limitations. (re-flash the MCU)
You guys talking about modding this light, (or any light for that matter) and with accompanying pics will eventually lead me to start my modding hobby. So far I have been in the ‘pleasure of owning one’ yet. And thanks, btw, for the discussions.
The pcb is spaced deeper into the tail cap with 1/4” thick copper risers to accommodate the double 18350’s in each bay.
Thankyou for that Dale 
With the kind permission of FmC, he has this mod on the Courui using XP-G2:
Thanks
Yes I saw that, thanks! subscribed.
Gearbest stalling a little over dispatch, been 4 days ‘processing’ and had some weird email from them saying -
‘Thank you very much for your recent communication.We sincerely apologize for any inconvenience that may have been caused.
We have informed our colleague to test the item and speed the shipment up already , could you wait for 1-2 workdays more?’
Do they normally test them before shipping? (or is this just another way of saying they are oos), all seems to be taking a bit of time, always the way when you want something though I suppose! 
Got a broken STL-V6 here waiting for a new driver too from HK which is taking a while. Remains to be seen if it works as I couldn’t find the original one anywhere, ended up getting this - 8.4V SST-50 5-Mode Memory Circuit Board for LED Flashlights Torch
As stated in the op, GB should start shipping out the lights (except the gray versions) by Sept. 29th, Shenzhen-time.
Edit: I have edited the title of this thread and copied the “Big Head” nickname as aptly coined by FmC’s thread: Courui Big Head overhaul with XP-G2
Ah, sorry in my rush didn’t see that.
I’d also be interested to know what batteries you guys plan to use in this? I have ordered a nitecore d4 charger but wanted some input on what protected cells to get and from where?
I have read quite a bit so far but it all gets a bit deep… lol.
Where's the gray version?
The first ‘prognosis’ of the gray version was about 10 working days from last week’s announcement, then with the China National Holiday (holiweek?) to start Oct. 1…well, we know the usual effect… Don’t just hold your horses, perhaps let them go back to the barn to rest. Haha
I will keep this thread informed on every pertinent information available. I’m with you with the gray version too, btw.
The first batch of 33 lights will be shipped today.
Well then I must of got lucky and been one of the first ones out, I received my shipping notice around 16:00EST 9/28.
I added a Y3 extension to the order threw customer service so maybe that’s why it went out already.
Edit, can we expect mail to sit during the holiday or will it actually continue to move?
BTW my 3s conversion / totally new buck driver is coming along great, there is a thread about it in the custom mod/DIY section called “buck driver component selection” by tterev3 if you want to watch the progress and see the preliminary spec’s.
Cheerios!